12815801 has 4 divisors (see below), whose sum is σ = 13162212. Its totient is φ = 12469392.

The previous prime is 12815797. The next prime is 12815813. The reversal of 12815801 is 10851821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10851821 = 487 ⋅22283.

It can be written as a sum of positive squares in 2 ways, for example, as 8410000 + 4405801 = 2900^2 + 2099^2 .

It is a cyclic number.

It is not a de Polignac number, because 12815801 - 2² = 12815797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12815851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173150 + ... + 173223.

It is an arithmetic number, because the mean of its divisors is an integer number (3290553).

Almost surely, 2^12815801 is an apocalyptic number.

It is an amenable number.

12815801 is a deficient number, since it is larger than the sum of its proper divisors (346411).

12815801 is an equidigital number, since it uses as much as digits as its factorization.

12815801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346410.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 12815801 is about 3579.9163398046. The cubic root of 12815801 is about 234.0176344857.

The spelling of 12815801 in words is "twelve million, eight hundred fifteen thousand, eight hundred one".